Socket.io & WebSocket Tester

Connect to any Socket.io or WebSocket URL, emit events, and monitor responses. Everything runs locally in your browser.

Loading Tool...

💡Help shape DevUtils.lol

No black-box support tickets. DevUtils.lol is built for you. Report bugs directly to our public repo, or come hang out with other devs in the community.

Frequently Asked Questions

It is a free online tool that allows you to connect to any Socket.io or WebSocket server, send custom messages, emit specific events, and monitor incoming responses in real-time. It is useful for debugging and testing real-time applications.

Yes, it is designed for production use. It is built with privacy in mind and runs entirely locally in your browser. No data is ever sent to a server.

Yes, it supports both Socket.io and raw WebSocket connections. You can switch between the two with a simple toggle.

Yes, you can send custom events and messages to the server. You can also set custom headers and authentication tokens.

Yes, all data is processed locally in your browser. No data is ever sent to a server. Your privacy is our top priority.

Socket.io & WebSocket Tester — 100% Client-Side - Privacy-First, Offline Developer Tool

Global Architecture: This tool runs entirely in your browser using WebAssembly. Unlike server-side alternatives, your data (JWTs, Logs, SQL) never leaves this device. It works offline and handles massive files (1GB+) bounded only by your RAM.